A player piano is a regular upright or grand that plays itself but can also be played normally by any individual. On uprights, the case is usually larger to accommodate the player mechanism. Older player pianos are controlled by pneumatics and newer player pianos are controlled by electronics.
A reproducing piano has an additional element of being able to add musical expression to the performance. These reproducers playback the artists full interpretation of the music when it was originally recorded.
There are 4-5 thousand parts in a player mechanism. This is in addition to the approximately 8 thousand parts in the ordinary piano.